My conjecture, reinforced after SIHH, is that the manufacture is conflicted about how much to support their vintage heritage. I think some don't want a vintage market to draw sales away from new models or resources away from new watch production. If the vintage stocks are decimated by high restoration costs so that only the ultra-fine pieces are left, they would present less of a threat while still generating a nice little profit center. Fine to stock a few in the museum (many bought at the QM of VC auction) as long as their purpose is to establish the historical credibility of the newer pieces.
the most impressive catalogues I had ever seen, along with the one from Oct 2003 which featured about 10 VCs no one had ever seen!